Ok, first thing to do is go to each computer and work out if it is getting an IP address from your adsl modem that will allow them to talk to each other.
My wireless router is assigning IP addresses 10.0.0.1 with a mask of 255.255.255.0 the gateway ie adsl router/modem (internal IP 10.0.0.138).
See what IP address and mask is on each machine and what gateway. If they are all similiar ie 10.0.0.1 10.0.0.2 10.0.0.3, then first step is done and working
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